Press die for simultaneous forming of bending and curling

ABSTRACT

A press die for combination forming, capable of simultaneously performing a bending process and a curling process, the press die including a first die installed so as to perform a vertical movement, a second die configured to support a workpiece from a lower side of the first die, a moving apparatus configured to move the workpiece being supported by the second die, a stripper configured to hold the workpiece being moved by the moving apparatus such that the workpiece is mounted on the second die, a third die provided on the first die to bend the workpiece being mounted on the second die, and a fourth die provided on the second die to curl the workpiece being completed with the bending.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims the benefit of Korean Patent Application No. 10-2012-0005990, filed on Jan. 19, 2012 in the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference.

BACKGROUND

1. Field

Embodiments of the present disclosure relate to a press die, and more particularly, to a press die for combination forming capable of performing a bending process and a curling process.

2. Description of the Related Art

In general, a press die is an apparatus to conduct a forming by disposing a material strip at an upper side of the die having a groove, and applying a force to the material strip such that the material strip is deformed in a shape corresponding to the groove, thereby manufacturing a product corresponding to the groove.

For a bending process of the press die, first a press is lowered such that a workpiece is held by an upper pad, hereinafter, referred to as a stripper, and then a bending punch is lowered to complete the bending forming. In order to prevent the product bent downward from being stuck, a lower pad is additionally used.

For a curling process of the press die, first, a press is lowered such that a workpiece is held by a stripper, and then the press is lowered such that a curling is formed by a curling die provided at a lower side.

As a separate press die is manufactured for each of the bending process and the curling process, the number of sets of die is increased and thus the working time is increased.

In addition, with the increase of the working time, the manufacturing cost is increased.

SUMMARY

Therefore, it is an aspect of the present disclosure to provide a press die for combination forming, capable of simultaneously performing a bending process and a curling process.

It is another aspect of the present disclosure to provide a press die for combination forming, capable of reducing the manufacturing cost with a simpler and smaller structure thereof.

Additional aspects of the disclosure will be set forth in part in the description which follows and, in part, will be apparent from the description, or may be learned by practice of the disclosure.

In accordance with one aspect of the present disclosure, a press die for simultaneous combination forming of a bending and a curling includes a first die, a second die, a moving apparatus, a stripper, a third die, and a fourth die. The first die may be installed so as to perform a vertical movement. The second die may be configured to support a workpiece from a lower side of the first die. The moving apparatus may be configured to move the workpiece being supported by the second die. The stripper may be configured to hold the workpiece being moved by the moving apparatus such that the workpiece is mounted on the second die. The third die may be provided on the first die to bend the workpiece being mounted on the second die. The fourth die may be provided on the second die to curl the workpiece being completed with the bending.

The moving apparatus may include a cam driver, a cam support portion, a cam slider, and a bending punch. The cam driver may be fixed to the first die and configured to move vertically according to the vertical movement of the first die. The cam support portion may be provided to correspond to the cam driver and slidably installed at the second die. The cam slider may be provided so as to perform a sliding movement in linkage with the cam support portion. The bending punch may be fixed to the cam slider and configured to support the workpiece such that the workpiece is mounted on the bending punch.

The moving apparatus may include a moving plate movably connecting the cam support portion to the cam slider.

The moving apparatus may further include a stopper configured to limit the movement of the cam slider.

The moving apparatus may further include a punch holder configured to move the fourth die vertically.

The press die may further include a gas spring configured to transmit a power to move the punch holder vertically.

The moving apparatus may further include a returning member configured to return the cam slider to an original position of the cam slider when the workpiece is completed with processing.

The cam driver may be provided at a lower surface thereof with a first inclination portion. The cam support portion may be provided with a second inclination portion corresponding to the first inclination portion.

The cam slider may move when the first inclination portion presses the second inclination portion when the first die is lowered, and as the cam slider moves, the workpiece may be fixed to the bending punch and the stripper.

The third die may include a bending portion to perform a bending process on the workpiece.

The third die may be lowered as the first die is lowered, so as to bend the workpiece fixed to the bending punch and the striper, thereby performing the bending process.

The fourth die may include a curling portion to perform a curling process on the workpiece.

The fourth die may be lowered as the first die is lowered, so as to curl the workpiece completed with the bending process in a state of being fixed to the bending punch and the stripper, thereby performing the curling process.

The press die may be provided in a rectangular shape, and the bending process and the curling process may be performed at eight forming portions including four plane forming portions and four edge forming portions.

An ejection may be performed at the four edge forming portions after an ejection is performed at the four plane forming units among the eight forming units.

In accordance with another aspect of the present disclosure, a press die for simultaneous combination forming of a bending and a curling includes a first die, a cam driver, a second die, a cam support portion, a cam slider, a bending punch, a stripper, a third die, and a fourth die. The first die may be installed so as to perform a vertical movement. The cam driver may be fixed to the first die and configured to move vertically according to the vertical movement of the first die. The second die may be configured to support a workpiece from a lower side of the first die. The cam support portion may be provided so as to correspond to the cam driver, and may be slidably installed at the second die. The cam slider may be provided so as to perform a sliding movement in linkage with the cam support portion. The bending punch may be fixed to the cam slider and may be configured to support the workpiece such that the workpiece is mounted on the bending punch. The stripper may be configured to hold the workpiece being moved by the cam slider such that the workpiece is mounted on the bending punch. The third die may be mounted on the first die, and may have a bending portion to bend the workpiece being mounted on the bending punch. The fourth die may be provided on the second die and have a curling portion to curl the workpiece being completed with the bending.

The press die may further include a moving plate movably connecting the cam support portion to the cam slider.

The press die may further include a stopper configured to limit the movement of the cam slider.

The press die may further include a punch holder configured to move the fourth die vertically.

The press die may further include a gas spring configured to transmit a power to move the punch holder vertically.

The press die may further include a returning member configured to return the cam slider to an original position of the cam slider when the workpiece is completed with processing.

The press die may be provided in a rectangular shape, and the bending process and the curling process may be performed at eight forming portions including four plane forming portions and four edge forming portions.

An ejection may be performed at the four edge forming portions after an ejection is performed at the four plane forming units among the eight forming units.

As described above, a die capable of simultaneously performing a bending process and a curling process is provided, the number of forming steps is reduced, thereby enhancing the spatial efficiency of the press equipment and the plant.

In addition, with a simplified and smaller structured, the manufacturing cost is reduced.

BRIEF DESCRIPTION OF THE DRAWINGS

These and/or other aspects of the disclosure will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a view schematically illustrating a press die for bending-curling simultaneous combination forming in accordance with one embodiment of the present disclosure.

FIG. 2 is an enlarged view showing a portion “A” of FIG. 1.

FIGS. 3-8 are views schematically illustrating the operation of the press die for bending-curling simultaneous combination forming in accordance with the embodiment of the present disclosure.

FIG. 9 is a plan view schematically illustrating the press die for bending-curling simultaneous combination forming in accordance with the embodiment of the present disclosure.

DETAILED DESCRIPTION

Reference will now be made in detail to the embodiments of the present disclosure, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout.

FIG. 1 is a view schematically illustrating a press die for bending-curling simultaneous combination forming in accordance with one embodiment of the present disclosure.

Referring to FIG. 1, a press die 1 for bending-curling simultaneous forming includes a first die 10 installed so as to perform a vertical movement, a second die 20 configured to support a workpiece 60 while being disposed at a lower side of the first die 10, and a moving apparatus 30 configured to slidably move the workpiece 60 being supported by the second die 20.

The first die 10 is provided so as to perform a vertical movement by an operating cylinder (not shown). A stripper 11 to support and hold the workpiece 60 and a cam driver 31 configured to move vertically according to the vertical movement of the first die 10 are fixedly installed to a lower surface of the first die 10 at a predetermined position.

The stripper 11 may include a gas spring (not shown) or an operating cylinder (not shown) that are elastically moved with respect to the first die 10.

In addition, a third die 40 having a bending portion 41 is fixedly installed on the first die 10 to bend the workpiece 60.

The third die 40 may be disposed between the cam driver 31 and the stripper 11 of the first die 10.

The second die 20 is installed opposite to the first die 10. A bending punch 34 and the moving apparatus 30 are installed at the second die 20. The bending punch 34 may be configured to support the workpiece 60, which is held by the stripper 11, from a lower side of the workpiece 60. The moving apparatus 30 may be configured to slide the workpiece 60 fixed by the bending punch 34 to a processing position.

The moving apparatus 30 includes the cam driver 31 fixed to the first die 10 and configured to move vertically according to the vertical movement of the first die 10, a cam support portion 32 installed at the second die 20 so as to correspond to the cam driver 31, a cam slider 33 provided so as to be slidable in linkage with the cam support portion 32, and a moving plate 30 a movably connecting the cam support portion 32 to the cam slider 33.

The bending punch 34 may be fixed to the cam slider 33 and configured to be slidable along with the slide movement of the cam slider 33.

The cam driver 31 is provided at a lower surface thereof with a first inclination portion 31 a that is inclined at a predetermined angle, and the cam support portion 32 is provided with a second inclination portion 32 a corresponding to the first inclination portion 31 a of the cam driver 31.

As the first die 10 moves downward, the first inclination portion 31 a of the cam driver 31 makes contact with the second inclination portion 32 a of the cam driver 31 to press the cam support portion 32 toward a front, and accordingly, the cam support portion 32 moves forward so that the cam slider 33 connected to the cam support portion 32 through the moving plate 30 a is moved.

The bending punch 34 which is configured to have the workpiece 60 mounted thereon is fixed to the cam slider 33.

As the cam slider 33 moves, the bending punch 34 moves forward together with the cam slider 33, and the workpiece 60 mounted on the bending punch 34 is moved to a processing position.

A fourth die 50 having a curling portion 51 is fixedly installed on the second die 20 to curl the workpiece 60.

The fourth die 50 may be provided at a lower side of the bending punch 34.

In addition, a guide block 39 is fixedly installed at the second die 20 to guide the vertical movement of the cam driver 31 and the third die 40. The guide block 39 is disposed between the cam driver 31 and the third die 40, so as to stably support the vertical movement of the cam driver 31 and the third die 40.

The moving apparatus 30 may further include a punch holder 37 such that the fourth die 50 moves vertically.

The punch holder 37 is installed so as to move vertically by the gas spring 38.

The moving apparatus 30 is provided at a rear side thereof with a stopper 35 configured to limit the movement of the cam slider 33.

A returning member 36 is provided at a front of the cam side 33 while being spaced apart from the cam slider 33 by a predetermined interval, to return the cam slider 33 to its original position when the workpiece 60 is completed with processing.

The returning member 36 is configured to restore the original positions of the cam support portion 32 and the cam slider 33 that are moved by the cam driver 31, and may include a fixed block fixed to the second die 20 and a retuning spring (not shown) configured to return the cam slider 33 and the moving plate 30 a.

Referring to FIG. 2, with reference to the press die 1 for bending-curling simultaneous forming, the workpiece 60 is mounted at a bending punch upper surface 34 a of the bending punch 34, and is fixed while being held by a stripper lower surface 11 a of the stripper 11 fixed to the first die 10.

The workpiece 60 fixed by the stripper 11 is subject to a bending process by the third die 40 that is lowered.

The third die 40 is a bending die that is provided at one end portion, which makes contact with the stripper 11, with the bending portion 41.

At the same time of when the bending process is completed, the workpiece 60 is subject to a curling process by the fourth process 50 that is provided at a lower surface of the bending punch 34.

The fourth die 50 is a curling die that is provided at one end portion, which makes contact with the stripper 11, with the curling portion 51.

Accordingly, the workpiece 60 fixed between the stripper 11 and the bending punch 34 is sequentially subject to the bending process and the curling process by the third die 40 and the fourth die 50.

FIGS. 3 and 8 are views schematically illustrating the operation of the press die for bending-curling simultaneous combination forming in accordance with the embodiment of the present disclosure.

Referring to FIGS. 3 to 8, the operation of the press die for bending-curling simultaneous forming is as follows.

The stripper 11, the third die 40 and the cam driver 31 are installed at the lower surface of the first die 10 that is provided so as to move vertically.

The second die 20 is provided at the lower side of the first die 10.

The cam support portion 32, the guide block 39 and the bending punch 34 are provided on the second die 20. The cam support portion 32 corresponds to the cam driver 31 of the first die 10. The guide block 39 may be configured to guide the vertical movement of the cam driver 31 and the third die 40 while being located at a position spaced apart from the cam support portion 32 by a predetermined interval. The bending punch 34 may be configured to support the workpiece 60 such that the workpiece 60 is mounted on the bending punch 34.

As the first die 10 moves downward, the workpiece 60 is held by the lower surface 11 a of the stripper 11 of the first die 10.

Referring to FIG. 5, in the state as above, as the first die 10 moves downward further, the first inclination portion 31 a of the cam driver 31 makes contact with the second inclination portion 32 a of the cam support portion 32.

As the first inclination portion 31 of the cam driver 31 moves downward further, the second inclination portion 32 a making contact with the first inclination portion 31 a is pushed, and thus the cam support portion 32 is slid forward.

As the cam support portion 32 is moved forward, the cam slider 33 connected to the cam support portion 32 through the moving plate 30 a is moved forward, and the bending punch 34 fixed to the cam slider 33 is moved forward.

The bending punch 34 moves the workpiece to the processing position, and the workpiece 60 is mounted on the bending punching upper surface 34 a and fixed between the bending punch upper surface 34 a and the stripper lower surface 11 a.

If the workpiece 60 is disposed at the processing position, the cam driver 31 and the third die 40 move downward by being guided by the guide block 39, and the bending portion 41 of the third die 40 bends the workpiece 60 being fixed between the stripper 11 and the bending punch 34.

At the same time of the bending process, the gas spring 38 of the second die 20 operates so that the punch holder 37 moves upward and thus the fourth die 50 moves upward.

Accordingly, a lower portion of the workpiece 60 is curled by the curling portion 51 of the fourth die 50.

If the bending process and the curling process are performed on the workpiece 60, the first die 10 is moved upward.

As the pressing force by the cam driver 31 is removed from the cam support portion 32, the cam slider 33 returns to the original state by the restoring force of the returning member 36.

At this time, the movement of the cam slider 33 is stopped by the stopper 35.

As the cam slider 33 returns to the original position, the bending punch 34 fixed to the cam slider 33 returns to the original position.

As the stripper 11 fixed to the first die 10 and the third die 40 move upward, the fixing of the workpiece 60 is released, thereby enabling a product finished with the bending and the curling to be ejected.

In this manner, the bending and the curling are simultaneously performed on the workpiece 60, so that the number of forming steps is reduced, thereby improving the productivity.

In addition, when an undercut shape is formed at the workpiece 60 by the curling process, an additional eject apparatus is not required, so that the number of forming steps is reduced.

FIG. 9 is a plan view schematically illustrating the press die for bending-curling simultaneous combination forming in accordance with the embodiment of the present disclosure.

Referring to FIG. 9, the press die 1 for bending-curling simultaneous forming is provided in a rectangular shape.

The press die 1 for bending-curling simultaneous forming includes four plane forming units 21 a, 21 b, 21 c and 21 d, and four edge forming units 22 a, 22 b, 22 c and 22 d.

The press die 1 for bending-curling simultaneous forming enables the finished product to be ejected in a single cycle. To this end, the ejection of the product is performed at the four plane forming units 21 a, 21 b, 21 c and 21 d, and then performed at the four edge forming units 22 a, 22 b, 22 c and 22 d.

That is because the moving apparatus 30 with respect to the four edge forming units 22 a, 22 b, 22 c and 22 d may be able to move after the movement of the moving apparatus 30 with respect to the four plane forming units 21 a, 21 b, 21 c and 21 d.

Although a few embodiments of the present disclosure have been shown and described, it would be appreciated by those skilled in the art that changes may be made in these embodiments without departing from the principles and spirit of the disclosure, the scope of which is defined in the claims and their equivalents. 

What is claimed is:
 1. A press die for simultaneous combination forming of a bending and a curling, the press die comprising: a first die installed so as to perform a vertical movement; a second die configured to support a workpiece from a lower side of the first die; a moving apparatus configured to move the workpiece being supported by the second die; a stripper configured to hold the workpiece being moved by the moving apparatus such that the workpiece is mounted on the second die; a third die provided on the first die to bend the workpiece being mounted on the second die; and a fourth die provided on the second die to curl the workpiece being completed with the bending.
 2. The press die of claim 1, wherein the moving apparatus comprises: a cam driver fixed to the first die and configured to move vertically according to the vertical movement of the first die; a cam support portion provided to correspond to the cam driver and slidably installed at the second die; a cam slider provided so as to perform a sliding movement in linkage with the cam support portion; a bending punch fixed to the cam slider and configured to support the workpiece such that the workpiece is mounted on the bending punch.
 3. The press die of claim 2, wherein the moving apparatus comprises a moving plate movably connecting the cam support portion to the cam slider.
 4. The press die of claim 2, wherein the moving apparatus further comprises a stopper configured to limit the movement of the cam slider.
 5. The press die of claim 2, wherein the moving apparatus further comprises a punch holder configured to move the fourth die vertically.
 6. The press die of claim 5, further comprising a gas spring configured to transmit a power to move the punch holder vertically.
 7. The press die of claim 2, wherein the moving apparatus comprises a returning member configured to return the cam slider to an original position of the cam slider when the workpiece is completed with processing.
 8. The press die of claim 2, wherein: the cam driver is provided at a lower surface thereof with a first inclination portion, and the cam support portion is provided with a second inclination portion corresponding to the first inclination portion.
 9. The press die of claim 8, wherein the cam slider moves when the first inclination portion presses the second inclination portion when the first die is lowered, and as the cam slider moves, the workpiece is fixed to the bending punch and the stripper.
 10. The press die of claim 1, wherein the third die comprises a bending portion to perform a bending process on the workpiece.
 11. The press die of claim 10, wherein the third die is lowered as the first die is lowered, so as to bend the workpiece fixed to the bending punch and the striper, thereby performing the bending process.
 12. The press die of claim 1, wherein the fourth die comprises a curling portion to perform a curling process on the workpiece.
 13. The press die of claim 12, wherein the fourth die is lowered as the first die is lowered, so as to curl the workpiece completed with the bending process in a state of being fixed to the bending punch and the stripper, thereby performing the curling process.
 14. The press die of claim 1, wherein the press die is provided in a rectangular shape, and the bending process and the curling process are performed at eight forming portions comprising four plane forming portions and four edge forming portions.
 15. The press die of claim 1, wherein an ejection is performed at the four edge forming portions after an ejection is performed at the four plane forming units among the eight forming units.
 16. A press die for simultaneous combination forming of a bending and a curling, the press die comprising a first die installed so as to perform a vertical movement; a cam driver fixed to the first die, and configured to move vertically according to the vertical movement of the first die; a second die configured to support a workpiece from a lower side of the first die; a cam support portion provided so as to correspond to the cam driver, and slidably installed at the second die; a cam slider provided so as to perform a sliding movement in linkage with the cam support portion; a bending punch fixed to the cam slider, and configured to support the workpiece such that the workpiece is mounted on the bending punch; a stripper configured to hold the workpiece being moved by the cam slider such that the workpiece is mounted on the bending punch; a third die mounted on the first die, and having a bending portion to bend the workpiece being mounted on the bending punch; and a fourth die provided on the second die, and having a curling portion to curl the workpiece being completed with the bending.
 17. The press die of claim 16, further comprising a moving plate movably connecting the cam support portion to the cam slider.
 18. The press die of claim 16, further comprising a stopper configured to limit the movement of the cam slider.
 19. The press die of claim 16, further comprising a punch holder configured to move the fourth die vertically.
 20. The press die of claim 19, further comprising a gas spring configured to transmit a power to move the punch holder vertically.
 21. The press die of claim 16, further comprising a returning member configured to return the cam slider to an original position of the cam slider when the workpiece is completed with processing.
 22. The press die of claim 16, wherein the press die is provided in a rectangular shape, and the bending process and the curling process are performed at eight forming portions comprising four plane forming portions and four edge forming portions.
 23. The press of claim 22, wherein an ejection is performed at the four edge forming portions after an ejection is performed at the four plane forming units among the eight forming units. 